A corpobation op



June 1 1926.

W. MC CONWAY P ttmted June 1, 19261t f ,UNITED STATES* PATENT OFFICE@ WILLIAM MCconWAY, or rITTsBURGH, PENNSYLVANIA; WM. MCCONWAY.' Jn.,

Environ or sans WI'LLIAM MccoNwAY, DEoEAsEnAssrGNoB To THE MCGQNWAY ac CUMPANY, F PITTSBUIWH, `PENN'SYLVANIA,-'A` CORPOBATIQN or METHOD or rnonuclne METAL nLAnxs.

` vApplausenon "mea november 1s, 1922i saisine. s013773.

,My invention relatestof a ymethod of proi ducingimetal blanks, laand has for its object tor ensurethat the metal thereof shall be uni` formlygood and sound throughout. It is:

l also, im object 'of the invention to attain the desired'resultby a- `few simple operationsy `and with n minimum discard of material.-

The primary feature of the invention, gen` erally stated, Consists in producing n. metal 1 blank'by im method which involves centrifugally casting n Inetaljrnember with sin opening allowing slaggy matter lto be eoncen trated '1n the Walls of ysaid opening, subsequently pressing the; member when heated so as to cause thek good clean metelithereo to close the opening Iamd effect an extrusion of then slaggy matter,- mnd thereater removing the slaggy nmtter.V I As willhereinafter up; pear, there re other features of" the invention 'residingin specific details of the proc- In order that articleswhich are forged,- rlleeh,y pressed or 'i smilrly pro duced from steel or other metalgsliall strong,fdurable u and reliable in rvieegit is important that the ,blanks or pieces `.from which they are fabricated 'shall besound and free'from defeats.-

In Letters Patent heretoforey granted to l0 me', No. 1,177,957, dated April 4,1916', are disclosed `ai methodrand an lapparatus for centrifugelly casting steel blanks having 'a rcentral hole orfopeningtherethrough.. "In :t steel member or* disk ofi-this oharascterl east centrifgally all slaggy matt'er'becomes con-4 eentrated in the Walls of the opening. This slaggy matter may bef eliminated yby simply forcing a ybrosch through the opening in Vthe disk es but such an operation results in 0 the kdiscard' of e considerable quantity'of sound steel, inasmuch as the slmggy matter is so,` disposed inthe Wlls of tlfxezopeningr of the I disk thatthe bloaeh in being driventhrough f torei'noyethe slaggy `nutterial eutskas quamtity of sound steel fromv the sides of the ori-` tice. By my present intent-ion theslaggy' mattei' may be removed Without any bronching operatiomloss of good steel is much reduced,qandA a solid blank or member ofclen sound steel, free from sir holes, gas or slag poe'ketsplpes or other imperfeotlons, is prodncedfin' which the line of solution of continuity ofthe` metal vWhere the holey in the east member originallyv existed is insignifieent and negligible. y

In the drawings chosen for they purpose of explaining themethod of producing a metal blank in' accordance with my invention,-

Fignre l isn sectional View of a esst steel Ydisk ory nnfnulus shown as in position to be subjected to pressure in die means eeeting the extrusion ofslaggy matter.

- Figure" 2 is a'detail View eorresponding.;r

to Fig.- 1,'but'illustrnting the naanner in which the slaggyxmatter flows toward the center of the .opening in the east metal mem` ber'when theflnltter is subjected to pressure. Figure is al View. similar to Fig. 2, but illustrating the manner in which continued pressure of the dies causes' the sound metal to meetnnd closel the` hole in the disk and to drive 4the slagontwardly. f

Figure 4 is s; sectional View corresponding toY Figal but `showing#the disk as having;I been pressed sulciently to compel the eX- `trusion ,of the slaggy material in the form of projections extending into'orifices in the die members.

Figure 5 is a perspective View of a. finished blanl'r from which a sector has been removed. inthe drawings, l indicates o.k cast steel f member illustrative of the initiftlstep in. the

production of a blank by my method of manufacture. j As shown, it is preferred to cast the member 1 as a hello-fs7 cylinder or per` forateddisk Whose ends may advantageously be slightly tapered, as indicated at 2. The member lV muy be of :my size or configuration required andy is east centrifugally so s. to effect nConcentrzitionofslaggy maten rial on the inner surface of the hole k3 of the disk.`v As cast eentrifugallythe slnggjy materinl 4 of the .disk l is'concentrated or disposes itself in the Walls of the opening 3 in the general form shown'in Fig' l.

miv

When heated the disk is subjected to pressure in extrusiondies to force the sla-g out- Wardly through openings `in said'dies disposed in alinement with the axis of the` disk. These dies preferably Aconsist of a solid cylindrical ring 5 with whichpressure applying plates or followers 6 and 7, respectively, cooperate. The lower plate 6, forming the base for the circumscribing ring 5, may advantageously have a shoulder or boss 8, fitting closely in the ring so as not only to center the latter but also to prevent escape of the metal of the disk when it is subjected to pressure. The upper follower plate 7 corresponds in form to the inner surface of the cylindrical ring 5, the clearance between the disk and ring being such that no appreciable amount of metal may creep between it and the ring. The plates 6 and 7 are respectively provided with centrally arranged apertures or openings 9 which are somewhat tapered from their inner sides outwardly to enable the disks to be readily stripped or freed from said plates at the completion of the pressing.

When the heated disk has been placed in position in the dies, as shown in Fig. l, the follower plate 7 is forced towards the lower follower plate 6 by means of a hydraulic press or other suitable means. As the upper follower 7 moves downwardly within the circumscribing ring die 5 the heated metal is caused to flow toward the center of the opening 8 in theV disk, thereby effecting bulging of the slag bearing walls of the opening, as illustrated in Fig. 2. At this stage of the pressing operation the disk is in the form la. Subsequent application of sufficient pressure to the follower plates 6 and 7 causes sound clean metal to contact or come together at the center of the disk, as shown in Fig. 3, and displace the slag 4 outwardly in the direction of the axis of the opening 3. At this stage the disk is in the form 1b. The pressure applied to the heated disk by the apertured follower plates 6 and 7 is continued to such extent as may be required to cause all slaggy matter to be extruded into the openings 9 of the followers, thus creating projections 10 containing the slaggy matter which extend outwardly from the body of the disk on opposite sides thereof. These projections are subsequently cutoff, thereby leaving, as illustrated in Fig. 5, a blank 1 of sound metal. It is to be understood, of course, that the projections 10 formed by the extrusion of the heated metal into the apertures 9 of the die means need not necessarily extend beyond the body of the disk as far as is shown in Fig. 4, and

preferably are only of sufficient length to ensure the removal of all slaggy and imperfect material.

l. The method of producing metal blanks, which involves forming a metal member having an opening therethrough, subjecting said member when heated to pressure causing metal to flow toward the center of and close said opening, and subsequently causing material originally disposed in the walls of said opening to flow in the direction of the axis of said opening.

2. The method of producing metal blanks, which involves centrifugally casting a metal member having an opening therein, and subjecting said member when heated to pressure causing a flow of metal effecting the closing of said opening by metal distinct from the material originally disposed in the walls of said opening.

3. The method of producing metal blanks, which involves forming a metal member having an opening therein, and subjecting said member when heated to pressure causing a. flow of the material of which said blank is composed edecting the closing of said opening b v metal distinct from the material originally disposed in the walls of said opening with an attendant extrusion in the direction of the axis of said opening of material originally disposed in the walls of said opening.

4. The method of producing metal blanks, which involves centrifugally casting a metal member having an opening therein, and subsequently closing said opening by subjecting said member when heated to pressure causing the extrusion of material originally disposed in the walls of said opening.

5. The method of producing metal blanks, which involves centrifugally casting a metal member having an opening therein, and thereafter subjecting said member when heated to pressure effecting a closure of said opening and the extrusion of a projection containing material originally disposed in the walls of said opening.

6. The method of producing metal blanks, which involves centrifugally casting a metal member having an opening therein, subjecting said member when heated to pressure effecting a closure of said opening by metal distinct from the material originally disposed in the walls of said opening and an attendant forcing toward the ends of said opening of material originally disposed in the walls thereof, and subsequently removing material originally disposed in the walls of said opening.

7. The method of producing metal blanks, which involves centrifugally casting a metal member having an opening therein, and pressing said member when heated in apertured die means to cause material originally disposed in the walls of said opening to be extruded and come to the surface.

8. The method of producing metal blanks, which involves forming a metal member with an opening therethrough in the walls of which slaggy matter is concentrated, subj ecting said member when heated to pressure between means having apertures overlap- 1,586,632 -p 'e B' ping said opening and continuing said presmatter is concentrated, and subsequently sure until said slaggy matterr isv extruded pressing said member when heated to cause into said apertures, and thereafter removing the good metal thereof to yolose said openl0 said slaggy matter. ing and force the slaggy matter outwardly 9. The method of producing metal blanks, in the direction of the axis of said opening which involves forming a metal member In testimony whereof I alix my signature, with an opening in the WallsV of which slaggy WILLIAM MGCNWAY. 

